Temperature Rise Associated with Adiabatic Shear Band: Causality Clarified

Guo, Yazhou; Ruan, Qichao; Zhu, Shengxin; Wei, Q.; Chen, Haosen; Lu, Juncheng; Hu, Bo; Wu, Xihui; Li, Yu Long; Fang, Daining

doi:10.1103/physrevlett.122.015503

Cited by 135 publications

(34 citation statements)

References 45 publications

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“…Combined with standard lattice and shear wave measurements for copper, the synchronisation time for the largest avalanche is predicted to lie in the range 2 to 80 μs, depending on the exact dimensions of its axes. The predicted synchronisation times are consistent with the observed time between avalanches in acoustic emission 10 and the delay between stress collapse and temperature rise in adiabatic shear banding 52 . Whilst the geometric prefactors presented are specific to the Eshelby inclusion, the L 3 C s −1 scaling is general to all 3D precursors, as is the spatial limitation to L, consequently all 3D mechanisms will have similar synchronisation times and in SOC, the same scaling law.…”

Section: Resultssupporting

confidence: 81%

Time limited self-organised criticality in the high rate deformation of face centred cubic metals

2020

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Plastic deformation is a fundamentally important physical process, ultimately determining how materials can be used. Metal plasticity is governed by dislocation dynamics and lattice twinning. Although many continuum constitutive models exist, plasticity is now known to occur in discrete events arising from the self-organisation of dislocations into ‘avalanches’ under applied stress. Here we extend avalanche plasticity to high strain rates, by introducing time limitation to self-organisation. At high rates large avalanches fail to form; the system must self-organise around new constraints. Various macroscopic consequences include an increasing rate of work hardening with strain rate. We perform new measurements on high purity copper that distinguish between instantaneous and permanent strength contributions across a strength transition at 104 s−1, showing the transition to be a change in structural evolution. Strong model agreement validates our time limited self-organisation approach. Our work results in a unified, physically realistic framework for plasticity, with wide applicability.

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Section: Resultssupporting

confidence: 81%

Time limited self-organised criticality in the high rate deformation of face centred cubic metals

2020

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“…Many researchers have attempted to develop methods to infer causality from observational data over for several years (Pearl, 1988b(Pearl, , 2000Neapolitan et al, 2004). While there have been some notable contributions in the field demonstrating the plausibility of learning causality from non-experimental data (Granger, 1969;Sims, 1972;Pearl, 2000), learning structural causal models from observational data is still a challenge (Guo et al, 2019). Recent advances in the field of discovering causality has looked at learning Causal Bayesian Network (CBN).…”

Section: Introductionmentioning

confidence: 99%

Causal Learning From Predictive Modeling for Observational Data

Ramanan

Natarajan

2020

Front. Big Data

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We consider the problem of learning structured causal models from observational data. In this work, we use causal Bayesian networks to represent causal relationships among model variables. To this effect, we explore the use of two types of independencies-context-specific independence (CSI) and mutual independence (MI). We use CSI to identify the candidate set of causal relationships and then use MI to quantify their strengths and construct a causal model. We validate the learned models on benchmark networks and demonstrate the effectiveness when compared to some of the state-of-the-art Causal Bayesian Network Learning algorithms from observational Data.

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“…Latest research 18 revealed that temperature rise cannot be the cause of adiabatic shear band. Rather, it might be the result of adiabatic shear localization.…”

Section: Introductionmentioning

confidence: 99%

Temperature rise caused by adiabatic shear failure in 3D braided composite tube subjected to axial impact compression

Pan

2019

Journal of Composite Materials

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Previous investigation on the crashworthiness of braided composite tubes did not take the relationship between adiabatic shear failure and temperature rise into account during dynamic loading. In this study, transient temperature rise caused by adiabatic effect was detected and captured for the three-dimensional braided carbon/epoxy composite specimens during axial impact compression under 600–800/s. A mesostructure model was established based on three-dimensional braided tube architecture to numerically characterize the mechanical and thermal response in material. Based on the results, non-uniform temperature distribution shows good correlation with adiabatic shear failure in the material. Key scientific issues are discovered including the position, morphology, time sequence, and response process of the temperature rise. The catastrophic shear behavior with accelerated temperature rise occurs after the peak force and accompanies the progressive failure process. Nodes having room temperature in the adiabatic shear zone indicates that some positions in plastic zone may still behave as elastic state. There exists different plastic slip distances due to shear instability in the path along or crossing the adiabatic shear band. Through this investigation, the model considering the adiabatic effect was able to show the dynamic shear mechanism involving the fracture position, morphology, and progressive thermo-mechanical response of the temperature rise, which cannot be revealed by experimental testing.

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Temperature Rise Associated with Adiabatic Shear Band: Causality Clarified

Cited by 135 publications

References 45 publications

Time limited self-organised criticality in the high rate deformation of face centred cubic metals

Time limited self-organised criticality in the high rate deformation of face centred cubic metals

Causal Learning From Predictive Modeling for Observational Data

Temperature rise caused by adiabatic shear failure in 3D braided composite tube subjected to axial impact compression

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